Metro ESM3 Flashcards
By utilizing the key controls, the escalators can be placed in the mode necessary to assist in evacuation. Where are the ‘key controls’ located at the Metro stations?
They are located to the left of the escalator as you face it, on the landing closest to the kiosk.
What practice of stopping an escalator is no longer encouraged?
Striking the sidewall panel at a point where the steps flattened out, prior to passing the comb plate at the top or bottom of the escalator.
A pressure switch is located at certain points to stop the escalator should it detect something caught between the sidewall panel and the step. How many pounds of pressure are needed to activate the system?
150 lbs
Single access stations, those with only one set of escalators to access the station, have an automatic fire suppression system, what type is it?
Deluge sprinkler system
Entry escalator will be shut down automatically when fire alarms are activated when?
With a 2-minute delay
In Metro Ops, what does to term ‘right of way’ describe?
The areas between the fences and tunnel walls, where the track bed is located.
What are the ‘running rails’ constructed of and it’s use?
They are constructed of a continuous welded steel rail that acts as a negative return for electric traction power.
What is used to ‘block’ switches’?
Cribbing
How far apart are signs located in the tunnels to show direction and distance to the next station or emergency exits?
800 feet
How far apart are ‘Danger High Voltage’ signs?
250 feet
Where are ‘no clearance’ signs located?
Every 50 ft in areas of no clearance
Tunnel ‘Safety walkways’ is what width, and located where?
They are 22 inches wide and located opposite the ‘third rail’.
What is the maximum travel distance to emergency exits?
1250 ft
What are the three (3) types of Metro tunnels?
Circular, Horseshoe, and Box (Cut and Cover)
A 13’-9” wide for single-track configuration, that have double track widths with poured concreted walls between the tracks and crossover access every 25 feet, the double width tunnels are 29’-0” wide. This would describe which type of tunnel?
Box (Cut and Cover)
For the At-Grade Right of Way: (surface level tracks), the Emergency Access gates are located every 800 ft and padlocked, which Metro keys should be used?
2595 or A289
To protect passengers in the train if possible, move them to safety walkways by using door #9 of the rail car only when?
It is not over the third rail
How much power does the Traction Power Substation (TPSS) supply the service yards?
750 Volts DC
What is the purpose of the ‘Tie breaker station’?
To provide uninterruptible third rail power supply for the yard.
For Rail cars, what is the maximum weight and spacing on the roofs?
250 lbs, spaced 30” apart
Four (4) current collector shoes are on each rail car, two per truck. When any one collector shoe is in contact with a live 3rd rail, what happens to the others?
All collector shoes on that car are also live.
Each rail car is equipped with a dynamic braking system. Dynamic braking is basically the reversing of the polarity of the voltage applied to the traction motor field windings. What speed must a rail car be moving in order to activate the dynamic braking system?
15 miles per hour
The batteries on all rail cars are connected in parallel. The battery system will supply power for up?
Two hours
What will the battery system supply power on the rail car?
Run the emergency lighting, communications equipment, running lights, and electric doors.